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#include <atomic.h>
#include <paging.h>
#include <libk/stdio.h>
#include <apic.h>
#include <ioapic.h>
#include <madt.h>
#include <timer.h>
mutex_t cnt_lock;
uint32_t ap_cnt = 0;
uint32_t bspdone = 0;
uint32_t ioapic_addr = 0;
uint64_t lapic_addr = 0;
uint32_t numcores = 0;
uint8_t cpu_apic_ids[256];
uint8_t curr_cpu_apic_id()
{
return (uint8_t)(((*((__volatile__ uint32_t *)((uint64_t)lapic_addr +
0x20))) >>
24) &
0xFF);
}
void clear_apic_errors()
{
*((__volatile__ uint32_t *)(lapic_addr + 0x280)) = 0;
}
void wait_for_delivery()
{
do {
__asm__ __volatile__("pause" : : : "memory");
} while (*((__volatile__ uint32_t *)(uint64_t)(lapic_addr + 0x300)) &
(1 << 12));
}
void select_ap(uint32_t apic_id)
{
*((__volatile__ uint32_t *)(lapic_addr + 0x310)) =
(*((__volatile__ uint32_t *)(lapic_addr + 0x310)) &
0x00ffffff) |
apic_id;
}
void send_init_ipi(uint32_t apic_id)
{
clear_apic_errors();
select_ap(apic_id);
/* trigger INIT IPI */
*((__volatile__ uint32_t *)(lapic_addr + 0x300)) =
(*((__volatile__ uint32_t *)(lapic_addr + 0x300)) &
0xfff00000) |
0x00C500;
wait_for_delivery();
select_ap(apic_id);
/* deassert */
*((__volatile__ uint32_t *)(lapic_addr + 0x300)) =
(*((__volatile__ uint32_t *)(lapic_addr + 0x300)) &
0xfff00000) |
0x008500;
wait_for_delivery();
}
void send_sipi(uint32_t apic_id)
{
clear_apic_errors();
select_ap(apic_id);
/* trigger STARTUP IPI for 0800:0000 */
*((__volatile__ uint32_t *)(lapic_addr + 0x300)) =
(*((__volatile__ uint32_t *)(lapic_addr + 0x300)) &
0xfff0f800) |
0x000608;
/* wait 200 usec */
wait(1);
wait_for_delivery();
}
void init_ap_cpus()
{
uint8_t bspid;
size_t i;
size_t j;
init_mutex(&cnt_lock);
map_addr(lapic_addr, lapic_addr, FLAG_PRESENT);
bspid = curr_cpu_apic_id();
for (i = 0; i < numcores; i++) {
/* do not start BSP, that's already running this code */
if (cpu_apic_ids[i] == bspid)
continue;
send_init_ipi((uint32_t)cpu_apic_ids[i] << 24);
wait(10);
for (j = 0; j < 2; j++) {
send_sipi((uint32_t)cpu_apic_ids[i] << 24);
}
}
bspdone = 1;
wait(10);
printf("ap_cnt: %d\n", ap_cnt);
}
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